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Another organism whose colonies are frequently ob-
tained from the pus containing the staphylococci is the
Streptococctis pyogenes of Rosenbach (Fig. 53). It was
found by him in 18 of 33 cases of
suppurative lesions studied, fifteen
times alone and five times with the
Staphylococcus aureus. It is a
spherical organism of.variable size
(0.4-1 // in diameter), constantly


FIG. 53.—Streptococcus pyogenes, from the pus
taken from an abscess; x looo (Frankel and

FIG. 54.—Streptococ-
cus pyogenes: culture
upon agar-agar two days
old (Frankel and Pfeif-

associated in pairs and chains of from four to twenty in-
dividuals. A special variety of it, known as Streptococ-
cus longus, sometimes forms chains of more than one
hundred members.

The organism stains well with ordinary aqueous solu-
tions of the anilin dyes, and also by Gram's method. Like
the coccus already described, it is not motile and does not
seem to form spores, though sometimes a large individual
—much larger than the others in its chain—may be ob-
served, and may suggest the thought of arthro-sporulation.